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A Hox-TALE Regulatory Circuit for Neural Crest Patterning Is Conserved Across Vertebrates Hugo J

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A Hox-TALE Regulatory Circuit for Neural Crest Patterning Is Conserved Across Vertebrates Hugo J Washington University School of Medicine Digital Commons@Becker Open Access Publications 2019 A Hox-TALE regulatory circuit for neural crest patterning is conserved across vertebrates Hugo J. Parker Bony De Kumar Stephen A. Green Karin D. Prummel Christopher Hess See next page for additional authors Follow this and additional works at: https://digitalcommons.wustl.edu/open_access_pubs Authors Hugo J. Parker, Bony De Kumar, Stephen A. Green, Karin D. Prummel, Christopher Hess, Charles K. Kaufman, Christian Mosimann, Leanne M. Wiedemann, Marianne E. Bronner, and Robb Krumlauf ARTICLE https://doi.org/10.1038/s41467-019-09197-8 OPEN A Hox-TALE regulatory circuit for neural crest patterning is conserved across vertebrates Hugo J. Parker 1, Bony De Kumar1, Stephen A. Green2, Karin D. Prummel3, Christopher Hess3, Charles K. Kaufman4, Christian Mosimann 3, Leanne M. Wiedemann 1,5, Marianne E. Bronner2 & Robb Krumlauf1,6 In jawed vertebrates (gnathostomes), Hox genes play an important role in patterning head 1234567890():,; and jaw formation, but mechanisms coupling Hox genes to neural crest (NC) are unknown. Here we use cross-species regulatory comparisons between gnathostomes and lamprey, a jawless extant vertebrate, to investigate conserved ancestral mechanisms regulating Hox2 genes in NC. Gnathostome Hoxa2 and Hoxb2 NC enhancers mediate equivalent NC expression in lamprey and gnathostomes, revealing ancient conservation of Hox upstream regulatory components in NC. In characterizing a lamprey hoxα2 NC/hindbrain enhancer, we identify essential Meis, Pbx, and Hox binding sites that are functionally conserved within Hoxa2/Hoxb2 NC enhancers. This suggests that the lamprey hoxα2 enhancer retains ancestral activity and that Hoxa2/Hoxb2 NC enhancers are ancient paralogues, which diverged in hindbrain and NC activities. This identifies an ancestral mechanism for Hox2 NC regulation involving a Hox-TALE regulatory circuit, potentiated by inputs from Meis and Pbx proteins and Hox auto-/cross-regulatory interactions. 1 Stowers Institute for Medical Research, Kansas City, MO 64110, USA. 2 Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA. 3 Institute of Molecular Life Sciences, University of Zurich, 8057 Zürich, Switzerland. 4 Division of Medical Oncology, Washington University in Saint Louis, St. Louis, MO 63110, USA. 5 Department of Pathology and Laboratory Medicine, Kansas University Medical Center, Kansas City, KS 66160, USA. 6 Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, KS 66160, USA. Correspondence and requests for materials should be addressed to M.E.B. (email: [email protected]) or to R.K. (email: [email protected]) NATURE COMMUNICATIONS | (2019) 10:1189 | https://doi.org/10.1038/s41467-019-09197-8 | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | https://doi.org/10.1038/s41467-019-09197-8 eural crest (NC) cells are a migratory and multipotent cell The sea lamprey offers an opportunity to address conserved type, representing a defining characteristic of verte- ancestral mechanisms of Hox2 NC regulation in vertebrates. The N 1–3 brates . The cranial NC emerges from the mid/hind- extant jawless vertebrates (cyclostomes), lamprey and hagfish, brain region and contributes to cartilage and bone of the pharynx. represent a sister group to gnathostomes, so comparisons between Gnathostomes (jawed vertebrates) exhibit nested Hox gene these lineages can provide insights into the evolution of gene expression domains (Hox codes) along the anteroposterior (AP) regulatory programs in vertebrates18–20. Such comparisons can extent of both the neural tube and adjacent NC. However, little is reveal aspects of vertebrate biology that were present in the known regarding shared versus independent regulation of Hox common ancestor of extant vertebrates and which have been expression in these two tissues. In NC of the pharyngeal arches conserved in each lineage. These studies can also identify features (PAs), the NC Hox code confers positional identity to each arch4. that differ between each lineage, which could represent diver- There is also evidence for an earlier role of Hox genes in regional gence from the ancestral vertebrate state in either/both lineages. generation of NC from the hindbrain4,5. Emergence of NC and While comparisons between cyclostomes and gnathostomes its underlying Hox code played an important role in craniofacial may reveal ancestral features of vertebrate hox2 regulation in evolution, giving rise to unique structures of the head and neck, the NC, little is known about the enhancers and regulatory including the jaws and hyoid apparatus used in feeding and factors underlying Hox NC expression in cyclostomes. Here, we respiration. Genome analyses together with gene expression and employ cross-species regulatory comparisons between lamprey functional studies have described a common framework for a and gnathostomes to isolate and characterize NC enhancers and gene regulatory network (GRN) that drives NC induction, spe- investigate ancestral regulation of Hox2 in vertebrates. cification, and migration across vertebrates, and some regulatory components are present in non-vertebrate chordates1,6,7. How- ever, Hox genes have not yet been integrated within the current Results formulation of the NC GRN. This is in part because the Expression of hox2 genes in lamprey cranial NC. In two species mechanisms regulating Hox expression in NC are relatively of lamprey, sea lamprey (Petromyzon marinus) and Arctic lam- unclear compared to the current knowledge of Hox regulation prey (Lethenteron camtschaticum), only two Hox2 paralogues in hindbrain segmentation4. Hence, despite the established (hoxα2 and hoxδ2) have been identified, but their orthology to functional roles of Hox genes in cranial NC4,8, whether the Hox gnathostome Hoxa2/Hoxb2 remains unresolved (Fig. 2a)21–23. code is coupled to this conserved NC GRN and if so how, is The sea lamprey has six Hox clusters, compared to the four unknown. It is unclear whether Hox networks that control axial clusters inferred in ancestral gnathostomes22. A recent recon- patterning and generation of NC are integrated within or are struction based on comparisons of gene order at the chromosomal working in parallel, independently from the NC GRN. level between vertebrate species supports a model in which the Hox2 genes are critical components of the cranial NC Hox ancestor of cyclostomes and gnathostomes also had four Hox code and provide an important avenue for addressing this clusters22, suggesting that the two additional Hox clusters in question. Experimental alterations in expression of gnathostome lamprey arose from duplication event/s in the lamprey/cyclostome Hox2 paralogues (Hoxa2 and Hoxb2) lead to homeotic transfor- lineage. To investigate the duplication history of lamprey Hox mations. In mice, ectopic Hoxa2 suppresses jaw formation9, clusters, previous work employed a chromosome-wide analysis while Hoxa2 mutants exhibit mirror image jaw duplication, of genomic synteny (duplicate gene retention) between lamprey indicating a role as a selector gene in NC AP identity4,8. Reg- Hox-bearing chromosomes22. These pairwise comparisons indi- ulatory analyses in mouse, chick, and zebrafish have identified cated that the chromosomes bearing the hoxα and hoxδ clusters evolutionarily conserved enhancers in the Hoxa2 and the Hoxb2 display a significantly closer relationship to each other than to genes that mediate their expression in NC and hindbrain seg- any other Hox-bearing chromosomes. Similarly, the chromosomes ments (rhombomeres (r)) (Fig. 1a, b)4,10–13. Analyses of mouse carrying the hoxβ and hoxε clusters also show a significant Hoxa2 and Hoxb2 NC enhancers provide conflicting mechanisms enrichment for shared paralogues with each other. This suggests for NC expression of Hox genes. A single 5′-flanking enhancer that these pairs of chromosomes derive from duplication event/s drives Hoxb2 in r4 and its NC11, supporting a model for shared that occurred more recently than the duplication events that regulation in these tissues (Fig. 1b). In contrast, independent gave rise to the other Hox-bearing chromosomes22. Phylogenetic exonic/intronic and 5′-flanking enhancers regulate Hoxa2 analyses reveal hoxβ and hoxε paralogues consistently clustering expression in r412 versus r4-derived NC14 (PA2), suggesting in protein trees21,22, while hoxα and hoxδ paralogues do not show the evolution of distinct regulatory mechanisms between the any clear patterns of clustering. This may be due to the limitations hindbrain and NC (Fig. 1a). Characterisation of cis-elements of phylogenetic analyses in resolving the relative timing of ancient required for the activity of these enhancers has provided some duplication events22. Thus, the evidence from synteny analysis insight into their underlying regulatory mechanisms (Fig. 1a, b). leads us to infer that hoxα2 and hoxδ2 genes are paralogues that Both the Hoxb2 r4/NC and the Hoxa2 exonic/intronic r4 arose from duplication in the lamprey/cyclostome lineage. enhancers depend upon the combined inputs from Meis and In exploring hox gene NC regulation in sea lamprey embryos, our Pbx-Hox binding sites for their activities11,15–17. However, the time-course analysis of hox1–3 expression revealed nested domains inputs into the independent Hoxa2 NC enhancer are largely in the pharynx from stage (st) 23, reminiscent of those in Arctic unknown, except for a binding site for transcription
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